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Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	$ 19,005
Ambac Financial Group
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	1,686
Assured Guaranty Corporation
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	3,661
Municipal Bond Insurance Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	4,920
Gov't National Housing Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	553
Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	10,820
Other Credit Enhanced Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	8,185
Pre-Refunded Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	8,321
Pre-Refunded Securities | Ambac Financial Group
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	136
Pre-Refunded Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	136
Pre-Refunded Securities | Other Credit Enhanced Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	8,185
Government Guaranteed Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	553
Government Guaranteed Securities | Gov't National Housing Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	553
Government Guaranteed Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	553
Exposure Net Of Pre-refunded & Government Guaranteed Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	10,131
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Ambac Financial Group
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	1,550
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Assured Guaranty Corporation
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	3,661
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Municipal Bond Insurance Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	4,920
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	$ 10,131

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